A dream of a narrow space can represent rigidity, limitations, restrictions, inaccurate presumptions, insecurity and righteousness. This dream could also be suggesting that you need extreme focus and discipline to accomplish a task, blocking out anything that would interfere with your perspective or goals.

Psychological / emotional perspective: A narrow bridge might suggest a difficulty in communication, perhaps in putting our ideas across. We should take care not to be narrow-minded and judgemental in our dealings with other people. We may be intolerant and parochial in our opinions.

Material aspects: When we dream of anything that is narrow, we are aware of restrictions and limitations. Sometimes we have created them ourselves, sometimes other people will have created them for us.

A narrow road would perhaps suggest some kind of restriction, and a warning that we must not deviate from our path.

A narrowboat highlights the meaning of a boat with the tendency to put additional restrictions in place.